Question

Is there something missing to this question below.

if not what are u and v values or vector

Answer 1

you don't need to know u and v to get the answer...

Answer 2

\[9\vec u \cdot (10 \vec u -5 \vec v)\]\[=90\vec u \cdot \vec u - 45 \vec u \cdot \vec v\]

Answer 3

\(\vec u \cdot \vec v\) is given. and
\[\vec u \cdot \vec u=\left( \| \vec u\| \right)^2\]

Answer 4

i got, thanks again

Answer 5

what if the question was find \[\huge||10u-5v||\] instead?
how can i solve that ?